Why is Vacuum Casting Preferred for Prototype model making

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Why is Vacuum Casting Preferred for Prototype
Model Making?

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Vacuum casting  is a widely used technique for
the production of plastic prototypes. Vacuum
casting is not only more economical but also the
ideal process for low to medium scale production
of plastic prototypes.
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Vacuum Casting The process
The process of vacuum casting consists of
multiple stages. The overall process is
labor-intensive but still relatively fast-paced
and easy to manage. The process is described as
stage-wise as follows
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1. Creating a master model
First of all, a master model has to be created or
obtained on the shelf. The master pattern can be
an industrial part or one created through rapid
manufacturing techniques like 3d printing or CNC
machine tools.
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2. Producing the mold
Once the master model is put inside the casting
box, liquid silicone is poured all over it and
then it is left to cure in an oven. The cured
liquid silicone mold is then cut open and the
master mold has removed that leaves behind an
empty cavity. 
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3. Making the casting copies
Now suitable resins (or polyurethane that are
like rubber) are mixed to ensure that the mixture
has the same properties as the industrial part.
The mixture is poured into the empty cavity to
form the desired finished mold or product. The
resin is then cured in a vacuum so that no air
bubbles are trapped.
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Why vacuum casting method is preferred
1. Quick results
The vacuum casting process is significantly rapid
and you can get a fixed volume of fully working
models in almost fewer days.
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2. Reduced cost of production
Silicone is a comparatively cheaper material and
a single mold can be used for multiple
prototypes, the process is overall very
economical as compared to other traditional
methods.
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3. Better product quality
In Vacuum Casting Service, not only the process
is fast but also the final high quality and has
better structural properties, rigidity, and
hardness.
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4. Better product finish
Silicone is the mold material, the final product
has an excellent finish and accurately resembles
the master pattern. Even the finest of details
are captured in the finished product.
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Vacuum Casting Service technology can often
achieve the same results with shorter lead times
and if without special material requirement. When
large industries have to meet deadlines in a
short period and just for functional and working
prototype testing, vacuum casting can often be a
better choice depending upon the requirements.
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